Lamp holder



FIG. 1 is a left, front, top perspective view of a lamp holder showing my new design;

FIG. 2 is a right, rear, bottom perspective view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is a rear plan view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top elevational view thereof; and,

FIG. 8 is a bottom elevational view thereof.

The broken lines in the drawings depict portions of the lamp holder that form no part of the claimed design. 

CLAIM The ornamental design for a lamp holder, as shown and described. 